[MITgcm-support] what's the difference between U, V, W, salt in data.diagnostic and the output result

[Martin Losch]

Hi,

the values in the dynDiag file are averages, with the averagin period specified by this line:
frequency(2) = 864000.,
to 10-day averages, while the other output (either in state.*.nc or in the *.data/meta files) are snapshots (frequency is controlled by dumpFreq in "data"). To reproduce this with diagnostics package you need to use a negative frequency (to get snapshots) and also a non-default "output phase" (by default the output is at the center of teh interval, so for frequency(2)=-864000., the first output would be after 5 days, the second after 10, etc). I think that timePhase(2) = 864000., would do the job, but please check with documentation.

btw, uvelmass is u*hfacw, and vvelmass is v*hfacs

Martin

On Mar 24, 2011, at 4:15 PM, Chun-Yan Zhou wrote:

> Hi all,
>  I just test the case of global_ocean.90x40x15 and noticed that there is 'UVEL    ' 'VVEL    ' 'WVEL    ' 'Salt   ' in the data.Diagnostics included in a filename 'dynDiag', but when I compared the UVEL of the 'dynDiag' file with the U output file at the same iteration, they are not equal. I don't know what's the difference.
>  Any suggestion is much appreciated.
>  
> the data.diagnostics file as follows
> &diagnostics_list
> # diag_mnc     = .FALSE.,
> # frequency(1) = 311040000.,
>   frequency(1) = 864000.,
>    filename(1) = 'surfDiag',
>    fields(1,1) = 'ETAN    ','ETANSQ  ','DETADT2 ',
>                  'PHIBOT  ','PHIBOTSQ',
> #                'DSLPuFlw','DSLPvFlw',
> # frequency(2) = 311040000.,
>   frequency(2) = 864000.,
>    filename(2) = 'dynDiag',
> # do not specify levels => all levels are selected
>    fields(1,2) = 'UVELMASS','VVELMASS','WVEL    ',
> #                'UVEL    ','VVEL    ','PHIHYD  ',
>                  'THETA   ','SALT    ','WVELSQ  ',
>  
>  
> Chunyan Zhou
> Division of Civil Engineering
> School of Engineering, Physics and Mathematics
> College of Art, Science and Engineering
> Fulton Building
> University of Dundee
> Dundee DD1 4HN
> The University of Dundee is a registered Scottish charity, No: SC015096
> 
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